43340665721609 has 8 divisors (see below), whose sum is σ = 43448547135840. Its totient is φ = 43232805465696.

The previous prime is 43340665721593. The next prime is 43340665721669. The reversal of 43340665721609 is 90612756604334.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 43340665721609 - 2⁴ = 43340665721593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43340665721669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1183724 + ... + 9385229.

It is an arithmetic number, because the mean of its divisors is an integer number (5431068391980).

Almost surely, 2^{43340665721609} is an apocalyptic number.

It is an amenable number.

43340665721609 is a deficient number, since it is larger than the sum of its proper divisors (107881414231).

43340665721609 is a wasteful number, since it uses less digits than its factorization.

43340665721609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10579159.

The product of its (nonzero) digits is 19595520, while the sum is 56.

The spelling of 43340665721609 in words is "forty-three trillion, three hundred forty billion, six hundred sixty-five million, seven hundred twenty-one thousand, six hundred nine".